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• Is basing storage requirements based on IOPS sufficient?

  - by Boden

  The current system in question is running SBS 2003, and is going to be migrated on new hardware to SBS 2008. Currently I'm seeing on average 200-300 disk transfers per second total across all the arrays in the system. The array seeing the bulk of activity is a 6 disk 7200RPM RAID 6 and it struggles to keep up during high traffic times (idle time often only 10-20%; response times peaking 20-50+ ms). Based on some rough calculations this makes sense (avg ~245 IOPS on this array at 70/30 read to write ratio). I'm considering using a much simpler disk configuration using a single RAID 10 array of 10K disks. Using the same parameters for my calculations above, I'm getting 583 average random IOPS / sec. Granted SBS 2008 is not the same beast as 2003, but I'd like to make the assumption that it'll be similar in terms of disk performance, if not better (Exchange 2007 is easier on the disk and there's no ISA server). Am I correct in believing that the proposed system will be sufficient in terms of performance, or am I missing something? I've read so much about recommended disk configurations for various products like Exchange, and they often mention things like dedicating spindles to logs, etc. I understand the reasoning behind this, but if I've got more than enough random I/O overhead, does it really matter? I've always at the very least had separate spindles for the OS, but I could really reduce cost and complexity if I just had a single, good performing array. So as not to make you guys do my job for me, the generic version of this question is: if I have a projected IOPS figure for a new system, is it sufficient to use this value alone to spec the storage, ignoring "best practice" configurations? (given similar technology, not going from DAS to SAN or anything)

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• Why does VIM say there is trailing whitespace on this command?

  - by Jesse Atkinson

  I am trying to write a beautify CSS command in vim that sorts and alphabetizes all of the CSS properties as well as checks to see if there is not a space after the colon and inserts one. Here is my code: nnoremap <leader>S :g#\({\n\)\@<=#.,/}/sort | %s/:\(\S\)/: \1/g<CR> :command! SortCSSBraceContents :g#\({\n\)\@<=#.,/}/sort | %s/:\(\S\)/: \1/g These work independently. However, I am trying to pipe them into one command. On save VIM says: Error detected while processing /var/home/jesse-atkinson/.vimrc: line 196: E488: Trailing characters Any ideas?

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• cpu load measure with hyperthreading on linux

  - by dronus

  How can I get the true usage of a multicore hyperthreading enabled cpu? For example lets consider a 2 core CPU, expressing 4 virtual cores. A single threaded workload would now show up as 100% in top, as one core of the virtual cores is completely used. The CPU and top work as expected, like there would be 4 real cores. With two threads however, the things get arkward: If all works well, they are balanced to the two real cores, so we got 200% usage: Two times 100% and two idle virtual cores, and are using all of the available CPU power. Seems ok to me. However, if the two threads would run on a single real core, they would show up as using two times 100%, that makes 200% virtual core usage. But on the real side, that would be one core sharing its power on the two threads, which are then using only one half of the total CPU power. So the usage numbers shown by top can not be used to measure the total CPU workload. I also wonder how hyperthreading balances two virtual on a real core. If two threads take a different amount of cycles, would the virtual cores 'adapt' so that both show a 100% load even if the real load differ?

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• Computer restarts without warning; code bcc116

  - by Robert C.

  Processor: Intel i5 4430 4-Core 4x3Ghz Motherboard: msi h87-g41 Graphics Card: Nvidia GTX760 Power supply: eps-750 cm RAM: 8GB I bought a new assembled gaming PC which worked fine for a few days. Then it started rebooting without warning. After it restarts windows 7 gives me an bbc 116 error code. Apparently it's something to do with my video card, either it overheating or wrong drivers. I've installed the latest driver from Nvidia for my graphics card. Since it's brand new it can't be dust, I'm running it with its lid open to see if the problem persists. I'm also running prime95 now to see if it tells me anything else. Using core temp it tells me that my CPU reaches up to 95° celsius with the blend stress test from prime95. Aaaand it just peaked to 100°. Of course it doesn't reach these temperatures at all while idle/gaming. I'm gonna let prime95 run for a night and to see what happens. Until then does anyone know what I should do next?

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• Have local admin privileges on Windows XP, but getting "Error terminating process: Access is denied"

  - by Chris W. Rea

  On one of the Windows XP machines I use regularly, there is a process that starts up periodically. I'd like to be able to kill the process – sometimes – because it occasionally runs when I'm busy doing something machine-intensive. I've already tried dropping the process priority to "Idle" to mitigate the effects, but it isn't the CPU that's the problem. Rather, the process is very disk-intensive and no matter the process priority, it still causes significant disk thrashing when running, impacting everything else I'm doing at the time. Using Process Explorer, I can find the process, right-click, and choose Kill Process, but I always get the message "Error terminating process: Access is denied." This is not an operating system process, but third-party software. What might that process be doing to prevent itself from being terminated? How can I kill such a process? Is there a way for me to modify the process's security or access control list (ACL) somewhere, using Process Explorer or another tool, so that I can effectively kill it?

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• Remove SID with ICACLS

  - by chris

  I am trying to remove an obsolete SID (the account was apparently deleted). I've tried to run the following on the server (win2003) and a client (win7): icacls c:\path /remove *S-1-5-21-1883347182-1220252494-433279356-1095 /T But I always get the output Successfully processed 0 files; Failed processing 0 files without it doing anything. How can I get it to work? Update: I've used AccessEnum to get the SID because icacls only says "No mapping between account names and security IDs was done." but doesn't show the sid. The output from AccessEnum is: "Path" "Read" "Write" "Deny" "c:\path" "Administrators, S-1-5-21-1883347182-1220252494-433279356-1095, ..." "Administrators, S-1-5-21-1883347182-1220252494-433279356-1095, ..." ""

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• Which hosting will let me execute my own EXE with PHP?

  - by guitar-

  I have a task that PHP (or any server-side scripting language) isn't practical for. It involves a lot of file I/O, processing, etc. and it will execute a lot faster using the program I made in C instead of PHP. Do any hosts allow you to upload your own EXE files and run them on the server using PHP's exec, shell_exec, etc. functions? Do you need a dedicated server to do this? Also, I don't know if Facebook's PHP HipHop is out yet, but I really don't want to use that.

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• How to make gVim transparent on Ubuntu 10.10?

  - by trolle3000

  I have a .gvimrc file that works fine on OS X 10.6, but won't work on Ubuntu. It contains a line that reads set transparency=15, and when i run gVim it reports: Error detected while processing /home/user/.gvimrc: line 25: E518: Unknown option: transparency=15 Any ideas to make gVim transparent by default? Chers! The whole .gvimrc file for completion: " Turn on line numbers set number " Change colorscheme colorscheme ir_black " Turns on the tab bar always set showtabline=2 " Number of horizontal lines on the screen set lines=60 " GUI Option to remove the Toolbar (T) set guioptions-=T " Sets the percent transparency set transparency=15

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• Mobile Intel® GMA 4500MHD boost

  - by Andy Smith

  My machine has a Mobile Intel® GMA 4500MHD integrated graphics chipset. The machine is currently running 64 bit windows 7 premium with 3GB of ram (1x1gb and 1x2gb). I note that the Mobile Intel® GMA 4500MHD shares the physical memory to process the graphics. now, the total available graphics memory can be up to 1,340 MB with a 32-bit operating system and 3 GB system memory or 1,759 MB with a 64-bit operating system and 4 GB system memory. I am considering investing in a 4GB stick to replace the 1gb stick bringing the total up to 6gb, mainly for an increase in graphics processing ability. Can anyone let me know what sort of power (if any over the 4gb) I could expect by upgrading to 6GB?

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• SBS 2003 stops to respond often due to limited memory

  - by Sanoj

  I have a Windows SBS 2003 Std that regularly stops to respond (crashes), in about every 20th day. The only thing I can see in the logs (the one that are mailed to the administrator) is that used memory increases with about 30MB/day. The process that uses more and more memory is sqlservr. We don't have much installed on the server; a Point-Of-Sale-system that uses Pervasive SQL as database and an Accounting application. We just have 2GB of RAM and I could upgrade to 4GB but I think that this just delay the problem. When the server stops to respond, the screen saver cannot be deactivated, no DNS-look-ups is working so the client's can't access Internet. And applications on the server do not reply. And we have to press the power-button to restart the server. For the moment it has an uptime of 19 days and have 2 345MB in memory use (idle) and sqlservr is using 819 MB. So I guess it will crash soon. Is there any solution to this problem? Could I limit sqlservr to some memory?

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• sysprep failure on Windows Server 2008

  - by dushyantp

  Before deploying a Azure VM Role, we need to perform %windir%\system32\sysprep\sysprep.exe /generalize /oobe /shutdown But in my case the sysprep fails with the log file %windir%\system32\sysprep\Panther\setuperr.txt saying: 2012-07-05 08:03:57, Error [0x0f0073] SYSPRP RunExternalDlls:Not running DLLs; either the machine is in an invalid state or we couldn't update the recorded state, dwRet = 31 2012-07-05 08:03:57, Error [0x0f00ae] SYSPRP WinMain:Hit failure while processing sysprep cleanup external providers; hr = 0x8007001f I do not always want to create a new image. Is there any work around? I followed the instructions in MS support here and tried: %windir%\system32\sysprep\sysprep.exe /generalize /oobe /shutdown /unattend:.\unattend.xml It did not work. Under certain circumstances, I need to tear down the VM Image from azure and re-deploy with some more changes. So sysprep has to run almost twice every week.

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• Extend RAID 1 (HP SmartArray P410i) running Linux

  - by Oliver

  I took over a fairly simple server setup with the following RAID 1 config running Ubuntu 11.10 (Kernel 3.0.0-12-server x86_64): => ctrl all show config Smart Array P410i in Slot 0 (Embedded) (sn: removed) array A (SAS, Unused Space: 1335535 MB) logicaldrive 1 (279.4 GB, RAID 1, OK) physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 1 TB, OK) physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 1 TB, OK) Initially there were two 300GB disks that got replaced by 1TB disks and I now have to extend the logical volume to use that extra space. However, when trying to do so I get the following warning: => ctrl slot=0 ld 1 modify size=max Warning: Extension may not be supported on certain operating systems. Performing extension on these operating systems can cause data to become inaccessible. See ACU documentation for details. Continue? (y/n) Is it safe to say yes or am I at risk of corrupting the file system / loosing data? Rearranging and extending the file system afterwards shouldn't be an issue as I can take the server offline and boot from a gparted live disk. Here's the config of the RAID controller in use: => ctrl all show detail Smart Array P410i in Slot 0 (Embedded) Bus Interface: PCI Slot: 0 Serial Number: removed RAID 6 (ADG) Status: Disabled Controller Status: OK Hardware Revision: Rev C Firmware Version: 5.12 Rebuild Priority: Medium Expand Priority: Medium Surface Scan Delay: 15 secs Surface Scan Mode: Idle Wait for Cache Room: Disabled Surface Analysis Inconsistency Notification: Disabled Post Prompt Timeout: 0 secs Cache Board Present: False Drive Write Cache: Disabled SATA NCQ Supported: True And the partition table: Number Start End Size Type File system Flags 1 1049kB 274GB 274GB primary ext4 boot 2 274GB 300GB 25.8GB extended 5 274GB 300GB 25.8GB logical linux-swap(v1)

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• What is meant by the terms CPU, Core, Die and Package?

  - by lovesh

  Now this might sound like too many previous questions, but I am really confused about these terms. I was trying to understand how "dual core" is different from "Core 2 Duo", and I came across some answers. For example, this answer states: Core 2 Duo has two cores inside a single physical package and dual core is 2 cpu in a package 2 cpu's in a die = 2 cpu's made together 2 cpu's in package = 2 cpu's on small board or linked in some way Now, is a core different from a CPU? What I understand is there is something that does all the heavy computation, decision making, math and other stuff (aka "processing") is called a CPU. Now what is a Core? And what is a processor when somebody says he has got a Core 2 Duo? And in this context what is a Package and what is a Die? I still don't understand the difference between Core 2 Duo and Dual Core. And can somebody explain hyper-threading (symmetric multi-threading) too if they are super generous?

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• Connection from Apache to Tomcat via mod_jk not working

  - by Tobias Schittkowski

  I would like to connect apache to tomcat via mod_jk (same machine). The ajp connector in tomcat is listening on port 8009, the worker settings are: worker.worker1.port=8009 worker.worker1.host=localhost However, the connection fails, here is the mod_jk debug log: [debug] wc_get_name_for_type::jk_worker.c (292): Found worker type 'ajp13' [debug] init_ws_service::mod_jk.c (1097): Service protocol=HTTP/1.1 method=GET ssl=false host=(null) addr=127.0.0.1 name=localhost port=80 auth=(null) user=(null) laddr=127.0.0.1 raddr=127.0.0.1 uri=/share [debug] ajp_get_endpoint::jk_ajp_common.c (3154): acquired connection pool slot=0 after 0 retries [debug] ajp_marshal_into_msgb::jk_ajp_common.c (626): ajp marshaling done [debug] ajp_service::jk_ajp_common.c (2449): processing worker1 with 2 retries [debug] ajp_send_request::jk_ajp_common.c (1623): (worker1) all endpoints are disconnected. [debug] jk_open_socket::jk_connect.c (485): socket TCP_NODELAY set to On [debug] jk_open_socket::jk_connect.c (609): trying to connect socket 560 to 0.0.0.0:0 [info] jk_open_socket::jk_connect.c (627): connect to 0.0.0.0:0 failed (errno=47) [info] ajp_connect_to_endpoint::jk_ajp_common.c (995): Failed opening socket to (0.0.0.0:0) (errno=47) Why does mod_jk try to connect to 0.0.0.0:0 and not to 127.0.0.1:8009??? Thank you for your help! Tobias

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• Very uneven CPU utilization with SQL Server 2012 on 2 processor computer with 16 cores / processor

  - by cooplarsh

  After installing SQL Server Enterprise 2012 with the Server + Cal license model, on a computer with 2 processors each with 16 cores (and no hyperthreading involved) and putting the server under extremely heavy load the 16 cores on the first processor were very underutilized, the first 4 cores on the 2nd CPU were heavily utilized, and the last 12 cores were not used at all (because of the 20 core limit for this sql server version). Total CPU utilization was displaying as around 25%. Unfortunately, the server suffered from extremely poor performance even though if the tasks were evenly distributed across the 20 cores it wouldn't have been anywhere near as bad. The Windows Server was running on a VMWare virtual image under ESX Server, but all of the CPU was allocated to the windows server. We tried changing affinity settings (e.g., allocating most cores to CPU and the others to I/O), but that didn't help solve the performance problems. Upgrading the product edition to SQL Server Enterprise Core 2012 not only allowed the SQL Server to utilize the 12 previously unused cores on the 2nd processor, but it also resulted in a much more even distribution of tasks across all of the processors. To get through the backlog of requests cpU utilization jumped to around 90%, and then came down to around 33% once it was caught up, but performance improved dramatically since we failed over to the newly updated version And the performance issues went away. I was wondering if anyone knows what might cause SQL Server to unevenly distribute the load, relying almost exclusively on the first 4 cores of the 2nd processor that had 12 cores idle, and allocate only a few tasks to each of the 16 cores on the first processor. Also, is there any way we could have more evenly distributed the load across the 20 cores that were being used without the product edition upgrade? The flip side of that question is what did the product upgrade do that caused SQL Server to start evenly distributing the load across all of the cores that it recognized? Thanks to any insight to answer these questions and/or links that might help me better understand how to make sense of what was happenings.

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• Copying files within a Workgroup

  - by Andrew La Grange

  I have three boxes operating in a Windows Server workgroup within a closed network. (No Domain / No AD) There are several derivations of the scenario that I'm about to outline, but I'm sure I will be able to retool the solution as and when I need. Essentially the boxes are: 2 x Windows Server 2008 R2 x64 Standard 1 x Windows Server 2000 Standard I need to be able to schedule the copying/and-or/moving of files from various directories and each of the boxes. Each box has a different username and password for the administrator. I have PowerShell 2.0 on the two Win2K8 boxes (obviously). Previously I have used mapped network drives to copy the files, and cmd line batches, but I'd much rather use Powershell if possible (with Shares and/or $ notation). However the Copy-Item cmdlet doesn't seem to be processing the Credential correctly. Perhaps some Powershell gurus out there might be able to help me. Essentially I'd like to schedule a PS run of script to push backup files onto my WIn2k box (old fileserver) periodically.

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• Apache mod_wsgi error: ImportError: No module named django.core.handlers.wsgi

  - by bigmac

  I am using Python 2.7 with mod_python 3.3.1 and mod_wsgi 3.3. I get an Internal Server Error and this stack trace in the apache logs: [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] import django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] ImportError: No module named django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] mod_wsgi (pid=4463): Target WSGI script '/home/one/codebase/campman/wsgi_handler.py' cannot be loaded as Python module. [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] mod_wsgi (pid=4463): Exception occurred processing WSGI script '/home/one/codebase/campman/wsgi_handler.py'. [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] Traceback (most recent call last): [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] File "/home/one/codebase/campman/wsgi_handler.py", line 13, in <module> [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] import django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] ImportError: No module named django.core.handlers.wsgi

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• Can't run node.js script on server reboot

  - by webstyle

  I need to listen events on port 3240 and I'm using node.js for that purpose. I need to execute my script with forever tool. I also need to run forever on server reboot. When I run forever glh.js everything works: forever list says there is a running process. But when I'm trying to run forever on server reboot I can't get it working. I've created a file in /etc/init.d with the following content: #!/bin/bash /var/www/yan/data/gitlabhook/runglh.sh &>/var/www/yan/data/gitlabhook/runglh.log When I reboot the server, the output log is the following (the same as when I run it manually via console): info: Forever processing file: glh.js But in this case forever doesn't start a process. forever list outputs: info: No forever processes running

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• Which Message Queue should I choose (must run on Linux)

  - by MHS

  There are many open source Message queues for Linux, and I need some help deciding what I should go for. My problem is simple - I get sent a list of files that needs to be processed. Each job can't be split up, but they are self contained and can be spread to multiple computers. I'm thinking of solving this using a message queue. Multiple clients send a message to a central queue. Each queue has a number of subscribers that will take jobs from that queue when they have finished processing the current job. Ideally it should have the following qualities Message queue must be able to store unprocessed messages in case of a shutdown/reboot A job can only be processed by a single subscriber (don't want duplicate jobs) The subscribers should be able to send jobs of their own, that will be processed by a different set of subscribers. Can anyone suggest a simple to use message queue?

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• Where is my CPU usage going?

  - by Josh

  My Ubuntu 10.04 Lucid virtual machine is saying it's at 100% CPU usage... but all I'm running is Thunderbird. According to top, CPU usage should be ~25.9%... How do I interpret this conflicting output from top? top - 13:55:26 up 3:35, 4 users, load average: 3.03, 2.59, 2.48 Tasks: 178 total, 1 running, 177 sleeping, 0 stopped, 0 zombie Cpu(s): 16.0%us, 79.7%sy, 0.0%ni, 0.0%id, 0.0%wa, 1.3%hi, 3.0%si, 0.0%st Mem: 509364k total, 479108k used, 30256k free, 3092k buffers Swap: 2096440k total, 58380k used, 2038060k free, 225116k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7708 jnet 20 0 480m 109m 17m S 18.4 22.1 21:59.14 thunderbird-bin 4615 jnet 20 0 5488 1268 1040 S 2.3 0.2 5:00.03 nx-rootless-ses 7124 jnet 20 0 56688 27m 4812 S 2.0 5.5 6:35.09 nxagent 6724 nx 20 0 9628 1400 636 S 1.6 0.3 3:26.59 sshd 30106 root 20 0 2544 1236 908 R 0.7 0.2 0:00.33 top 19 root 20 0 0 0 0 S 0.3 0.0 0:22.45 ata/0 38 root 20 0 0 0 0 S 0.3 0.0 0:05.53 scsi_eh_1 345 root 20 0 0 0 0 S 0.3 0.0 0:04.72 kjournald 1719 root 20 0 3260 1192 944 S 0.3 0.2 0:17.36 vmware-guestd 1 root 20 0 2804 1356 940 S 0.0 0.3 0:01.99 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd 3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 4 root 20 0 0 0 0 S 0.0 0.0 0:00.15 ksoftirqd/0 5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/0 ... Specifically I'm referring to the fact that the CPU usage totals show 0% idle time: Cpu(s): 16.0%us, 79.7%sy, 0.0%ni, 0.0%id, 0.0%wa, 1.3%hi, 3.0%si, 0.0%st Yet when adding up the percentages in the %CPU column I get 25.9%, not 100%!

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• Software Diagnostics Tool recommendations for Debugging a Windows 8 freeze

  - by Stuart

  I've had my HP Pavillion dv6 laptop since last November - and it has had 8GB RAM and a 256GB Crucial M4 SSD installed since the start. I use it for software development and it's had a Windows 8 RTM installation since early September. Yesterday I had to give a presentation at a customer site - so used Powerpoint for the first time since installing Win8... since that point my machine has 'frozen' every 2 hours or so after startup. There doesn't seem to be any easy to see reason behind the freeze - the system just freezes, even if I have left it idle with just a desktop there. My immediate suspicion is that the SSD is the mostly likely cause of the problem. I've looked at some of the questions on here - e.g. How do I troubleshoot hardware issues related to a computer freeze/crash? - but don't really want to start taking my laptop apart. Another suspicion is that this might be related to the WiFi adapter (Broadcom 802.11n) since I have noticed that this doesn't seem to play perfectly with things like Hyper-V in Win8. Can anyone recommend any software diagnostic tools that I can run in order to evaluate the health of the SSD or of other parts of the system? Thanks Stuart P.S. I doubt Powerpoint is the cause of this, but I may use it as an excuse never to use it again... More realistically perhaps something got damaged during travel to the customer site?

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• High IOWait executing JBoss 3.2.7

  - by user64205

  Server Details: Kernel: Linux wiq31 2.4.21-9.ELsmp #1 SMP Thu Jan 8 17:08:56 EST 2004 i686 i686 i386 GNU/Linux CPU: 4 x Intel(R) Xeon(TM) CPU 3.06GHz Memory: 1028520 kB JBoss version: 3.2.7 Every time i try to start JBoss, in all CPU's, the iowait values starts to raise and the idle values starts to fall. Before executing my JBoss application, the free command returns the following output: *total used free shared buffers cached Mem: 1028520 966400 62120 0 187756 538928 -/+ buffers/cache: 239716 788804 Swap: 2044072 790672 1253400* After starting my JBoss application, the free command returns the following output: *total used free shared buffers cached Mem: 1028520 1007648 20872 0 187116 524084 -/+ buffers/cache: 296448 732072 Swap: 2044072 819096 1224976* After starting my JBoss application, without answering any request, the java process /proc/PID/status file have the following values: State: S (sleeping) SleepAVG: 27% Tgid: 24022 Pid: 24022 PPid: 21011 TracerPid: 0 Uid: 500 500 500 500 Gid: 500 500 500 500 FDSize: 256 Groups: 500 VmSize: 775200 kB VmLck: 0 kB VmRSS: 156752 kB VmData: 696752 kB VmStk: 36 kB VmExe: 21 kB VmLib: 710375 kB StaBrk: 0804f000 kB Brk: 095bb000 kB StaStk: bffff8c0 kB ExecLim: ffffffff Threads: 62 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000000000000 SigCgt: 1000000180015ccf CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 Is this behavior being caused by memory swapping, or the short memory available in the server is enough to run my application?

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• Does AMD Cool n Quiet Slow Down Your System?

  - by Software Monkey

  I discovered today that having AMD Cool n Quiet enabled in my BIOS appears to be slowing down my Windows XP SP2 system by about 29% on memory & CPU intensive workloads. I was wondering if (a) anyone else had encountered this, (b) anyone can offer an explanation, (c) there are any negatives I need to be aware of if I keep AMD CnQ disabled. With some superficial testing so far, I don't immediately notice any difference with CnQ off (other than the performance being what I expected from this new hardware). It seems to ramp up the CPU fan a little bit as my program maxes out 1 core, but that's the same as with CnQ on. And when I let the system idle the CPU fan slows down and the systems as quiet as a mouse (after years of 6 small fans churning like they want to go into orbit it's nice to again have a system where I can hear the HDDs seeking). Bonus question: Does CnQ cause issues with system stability? I ask because the reason I disabled it was because I have had a few freezes and 1 spontaneous reboot with my new hardware.

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• Throughput; capacity planning help for C10K like design

  - by z8000

  I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity planning, in particular with the system resource costs associated with handling messages from/to clients. There's an article that tried to get 1 million clients connected to the same server [1]. Of course, most of these clients were completely idle in the test. If the clients sent a message every 5 seconds or so the system would surely be brought to its knees. But... How do you do less hand-waving and you know, measure such a breaking point? We're talking about messages being sent by a client over a TCP socket, into the kernel, and read by an application. The data is shuffled around in memory from one buffer to another. Do I need to consider memory throughput ("5 GT/s" [2], etc.)? I'm pretty sure I have the ability to measure the basic memory requirements due to TCP/IP buffers, expected bandwidth, and CPU resources required to process messages. I'm a little dim on what I'm calling "thoughput". Help! Also, does anyone really do this? Or, do most people sort of hand-wave and see what the real world offers, and then react appropriately? [1] http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ [2] http://en.wikipedia.org/wiki/GT/s

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• Win 2008 R2 - copying TO disk is very slow, copying FROM is more or less okay

  - by avs099

  I have Windows 2008 R2 SP1 with 4 identical SATA disks (Seagate Barracude 7200) in RAID 5 array. It has 4Gb of memory; all recent updates are installed. Problem: when I copy large file from one folder to another, I get about 10MB/s average speed. When I read this file from network share via 1Gbps connection - I get about 25-30 MB/s. Both numbers seems to be low for me - but specifically I'm very frustrated with low write speed. there is no antivirus, no hyper-v, it's just a fileserver - i when i do my tests nobody else reads/write from it (we have only 4 people in a team, so I'm sure). Not sure if that matters, but there is only 1 logic disk "C" with all available space (1400 GB). I'm not an admin at all, so I have no idea where to look and what other information to provide. I did run performance monitor with "% idle time", "avg bytes read", "avg byte write" - here is the screenshot: I'm not sure why there are such obvious spikes. Any idea? Please let me know if you need me to provide more information - what counters should I check, etc. I'm very eager to get this solved. Thank you. UPDATE: we have another Windows 2008 R2 SP1 server with 2 RAID1 arrays - one is disk C (where windows is installed, another one is disk E). It is running Hyper-V and does not have antivirus. I noticed the following behavior when I copy large file (few GBs): C - C: about 50MB/sec C - E: about 55MB/sec E - E: 8MB/sec!!! E - C: 8MB/sec!!! what could cause this?? E drive is RAID1 array from same Seagate Barracuda 1TB drives..

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